Voltage - Clamping (Max) @ Ipp:	29.2V
Supplier Device Package:	SMF (DO-219AB)
Package / Case:	DO-219AB
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 175°C (TJ)
Capacitance @ Frequency:	320pF @ 1MHz
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	200W
Current - Peak Pulse (10/1000µs):	6.8A
Series:	--
Voltage - Breakdown (Min):	20V
Voltage - Reverse Standoff (Typ):	18V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

TVS diodes are components that are used to protect electronic circuits from transients such as electrostatic discharge (ESD), which can be caused by sudden high voltage or current. The SMF18A-E3-18 is a bidirectional TVS diode released by Changpu Component in 2018. This article will provide an overview of the features, applications, and working principle of SMF18A-E3-18 TVS diodes.

Features

The SMF18A-E3-18 TVS diodes are designed in a small, easy-to-mount SMF package. They have a maximum forward voltage drop of just 0.6V, making them suitable for 5V and above systems. They can withstand transients up to 18V and can handle up to 5A of continuous reverse current. These devices provide a low capacitance for minimal disruption to data signals and improved surge performance. They also feature fast response times of less than 1ns, making them suitable for fast and accurate protection.

Applications

The SMF18A-E3-18 TVS diodes are suitable for a wide variety of applications. They are commonly used in high-speed data line protection, such as USB ports or Ethernet. They can also be used for any type of 3V to 5V circuits, such as personal computers, automotive systems, and consumer electronics.

Working Principle

The SMF18A-E3-18 TVS diode is a three-terminal device that helps protect sensitive components from voltage transients. It is composed of two PN junctions connected back-to-back. The inner junction acts as a breakdown device that can clamp the voltage below the maximum working voltage. The outer junction serves as a protection device that diverts the current away from the inner junction when used in unidirectional mode configuration. When current reaches the inner junction, the diode clamps the voltage, limiting the current and reverse-biasing the outer junction to prevent damage to the components.

Conclusion

The SMF18A-E3-18 TVS diode is a bidirectional protection device released by Changpu Component in 2018. It is designed in a small, easy-to-mount SMF package and features a maximum forward voltage drop of 0.6V. It can also handle up to 18V and 5A of continuous reverse current, making it suitable for a wide variety of applications, such as high-speed data lines and 5V systems. The diode works by clamping the voltage and diverting the current away from sensitive components.

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